Losing Chris has left a hole in our hearts.

Chris summed up positive psychology in three words, "Other people matter." 

Various groups and individuals have posted tributes online, including The University of Michigan obituary and Positive Psychology News Daily's article, You Mattered, Chris, where 50 comments were posted with memories and pictures of Chris.

At the 2012 MAPP Summit, Martin Seligman gave him the following tribute: